Projector table



Nov. 12, 1929. w, HENK 1,735,276

PROJECTOR TABLE Filed NOV. 14, 1927 30 supportin patented' Nav. 12, 1929 UNITED STATES 'PATENT oFFlcI-:f

WILHELM HENK, I' VIENNA, AUSTRIA PBQJ'ECTOR TABLE Application illed November 14, 1927, Serial Kp. 233,247, and inv Austria llefvember 17, 1928.

This invention relates to an improved projector-table, which is particularly suited for N the projection of the text and drawings or pictures contained in books, and further for the projection of maps with the aid of an episcope.

One mode of carryingout the persent invention is illustrated by way of example on -the accompanying sheet of Vdrawings in Figs. 1 and 2 show the projector-table in plan view and side view respectively.

Figs. 3 and 4 are detail views in section, the sections being taken on line a-b and o-d respectively of Fig. 1.

The projector-table according to the present invention comprises a stand provided with a late for thefreception of the apparatus and with a member movable in a vertical direction by means of toothed wheels. The stand comprises four cylindrical legs 1, which are provided with racks extending over a part of the saidflegs. The exact distance between the legs can be adjusted by four rods 2, which are screw-threaded and screwed intoa suitably shaped base of the-legs.

A frame, consistingpof cylindrical transverse rods Sand of two longitudinal rods 4, 4 is firmly secured to the upper endsof the legs 1. A plate 5, carrying qthe projector ,is slidably mounted on the longitudinal bars 4. The plate is carried and guided by sleeves 6, 6 and by-a square frame,

which consists of two angle irons 7, 7 (Fig:

3). The. frame is attached by sliding the sleeves 6', 6 onto the bars 4, after the same have been pulled out of their bea-rings by removing the screws 4. Nowr the angle-iron 7 is" placed onto the bar 4 and screwed to the angle-iron 7 ofthe guide-frame shown-in Fig. 3. The members 6, 6 and 7 are fixed to the plate 5. The latter consists of a-w'ooden frame 8 provided with a glass plate 9 and the outer edges ofthe frame 8 are stepped as -shown at 10 for the reception of the projector P.

The vertically .movable part comprises 'a table 12, a wooden plate`13cand toothed wheels.'

The wooden plate 13 is slidable-'in the longitudinal direction of the plate 12 and can yn'ected with'the main-bearings be pulled out or pushed in in the-,transverse direction of the latter. l J

Two angle-irons 25 and 25 are screwed to the lon 'tudinal sides of the plate 1 2 and act as ui es for the movement of the late 13 55 in the ongitudinal direction of the p ate 12N Guide-plates 26, 26 are slidable on the angle-- irns 25, 25 and are screwed to two U-sha ed iron 27, 27 in which rests the plate 13. he latter is slidable in the transverse direction 5 and preferably'serves for supporting dependingparts for instance book-covers.

he pla/te 12 rests on'springs 14, which are mounted on supports 15, connected with the main-bearings 15 of .toothed wheels. The 5 four toothed wheels 16 and' 16 .mesh with the racks of the legs 1 and during the rotad tion of a handle It, which is keyed to the shaft of the toothed wheels 16, operate on the racks. By means ofbevel wheels 17 17 the otation is transmitted to the toothed wheels -The toothed wheels 16 and 16 are mounted at 18 and 18 respectively, while the bevel 5 -wheels 17 and 17 are supported at 19 and 19 respectively. These bearings are in the .shape of simple arms, which embrace the 'wheel-shafts (Fig. '2) 'and are rigidly con- 15, slidable.su along the legs 1. Thus the toothed wheels, the table v12 and the plate 13 form a unit,V v which is slidable along the legs 1.. The ic.- tures-to be projected and laced on the p ate 12 can be pressed against t e'plate 5 and thus 35 gailrlst the projector by operating the hanv In order to prevent theplate 12 from moving downward or the toothed wheel from rotat-ing backward in case the plate 12 is heav- 90 ily loaded for instance by a heavy book B, a ratchet wheel 20 is keyed to one of the shafts ofthe toothed wheels and engaged by a pawl 21, which is secured to the main-bearing.

Springs 22, attachedon the one hand to an 95 immovable part and on the other hand to a movable part'of the episcop'e (at 15), serve for facilitating the adjustment of the toothed wheels and thus of the plate 12. A screw 28 locks the plate 13 against longitudinal ad- 100 justment and a screw 29 arrestsv the same against transverse movement.

In place of the racks and toothed vvheels,

pulling members such as steel bands, (wire ropes, chains or the like) may be employed h for moving the table in a vertical directipn, the said members being fixed to the table or toits supporting rails and pass over the rolls of a winch. I claimti'on, comprising inl combination a longitudinally movable frame for the reception of a projector, a table for carrying the object to be projected and extending over the entire length of movement of the frame and dis-v posed underneath the frame, and means for adjusting the said table in a vertical direc,- tion.

2. A projector-table for episcopic projection, comprising in combination a longitudinally movable framey for the reception oi a rojector, a table for carrying theobject to e projected and extending over the entire length of movement of the frame and disposed underneath the frame, means for adjusting the said table in a vertical direction, and a l plate mounted longitudinally and transverse ly movable on thesaid table, for the purpose specified. -v

3. A projector-table for e iscopic'projection, comprisin in combination a longitudi v nally movable rame for the reception of a projector, a table for carrying the object to be projected and extending over the entire length of movement of the frame-and dis posed underneath'the frame, racks provided on the legs of the projector-table, and toothed wheels meshing with the said racks `for adjusting in a vertical direction the table carrying the object to be projected.

4'. Projector-table as claimed in claim 2, in i which the verticallymovable' table rests on springs, for the purposespeciiied,

' 5. Projector-table as claimed in claim 3, in

-Whichtheyertically movable table rests on springs, for the purposes specied. ln testimony whereof l ax my signature; `Wninnnr/i HENK. -f

l. A projector-table for episcopic projec- 

